Influence of PANi Additions on methanol sensing properties of ZnO thin films

Mohammad Hafizuddin Hj Jumali, and Norhashimah Ramli, and Izura Izzuddin, and Muhamad Mat Salleh, and Muhammad Yahaya, (2011) Influence of PANi Additions on methanol sensing properties of ZnO thin films. Sains Malaysiana, 40 (3). pp. 203-208. ISSN 0126-6039


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The influence of PANI additions on methanol sensing properties of ZnO thin films at room temperature had been investigated. Commercial polyaniline powder (PANI) was mixed into 3 mL ZnO solution in five different weight percentages namely 1.25, 2.50, 3.75, 5.00 and 6.25% to obtain ZnO/PANI composite solutions. These solutions were spin coated onto glass substrate to form thin films. Microstructural studies by FESEM indicated that ZnO/PANI films showed porous structures with nanosize grains. The thickness of the film increased from 55 to 256 nm, proportionate to increment of PANI. The presence of 2 adsorption peaks at ~310 and ~610 nm in UV-Vis spectrum proved that addition of PANI has modified the adsorption peak of ZnO film. Methanol vapour detection showed that addition of PANI into ZnO dramatically improved the sensing properties of the sensor. The sensors also exhibited good repeatability and reversibility. Sensor with the amount of PANI of 3.75 wt% exhibited the highest sensitivity with response and recovery time was about 10 and 80 s, respectively. The possible sensing mechanism of the sensor was also discussed in this article.

Item Type:Article
Keywords:Gas sensor; methanol vapour; microstructure; UV-Vis analysis; ZnO/PANI thin film
Journal:Sains Malaysiana
ID Code:698
Deposited By: Mr Azam
Deposited On:23 Mar 2011 02:48
Last Modified:14 Dec 2016 06:27

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